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https://faq.usps.com/s/article/What-are-the-Types-of-First-Class-Mail
What are the Types of First-Class Mail®? First-Class Mail® service is the least expensive, most immediate options for mailing postcards, letters, large envelopes (flats), and parcels.
https://www.mentalfloss.com/article/501846/map-how-figure-out-when-your-letter-will-arrive
Jun 13, 2017 · The map, which depicts the USPS's service standards as of April 1, is organized by both the class of mail (First-Class Mail, Standard Mail, etc.) and by the zip code of origin.
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